Finding the Fourth Proportional to 1,725.30, 2,582.55 and 1,239.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.30 : 2,582.55 = 1,239.30 : x
2. Step 2: Convert to fraction form
   1,725.30/2,582.55 = 1,239.30/x
3. Step 3: Cross multiply
   1,725.30x = 2,582.55 × 1,239.30
4. Step 4: Simplify right side
   1,725.30x = 3,200,554.22
5. Step 5: Solve for x
   x = 3,200,554.22/1,725.30
6. Step 6: Final answer
   x = 1,855.07